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Modified lignin and separation methods

a technology of lignin and separation methods, which is applied in the field of processing of lignocellulosic biomass, can solve problems such as difficulty in valorisation

Inactive Publication Date: 2019-07-11
THE UNIV COURT OF THE UNIV OF GLASGOW
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes methods for producing high-quality lignin, cellulose, and hemicellulose products from various feedstocks, especially woody feedstocks. The use of n-butanol as a solvent instead of ethanol or ethanol / water reflux temperatures allows for improved results. The methods can be used for both ethylated lignin and its corresponding products, except for the heating step. The patent text provides a useful tool for biomass processing and the production of valuable products.

Problems solved by technology

Unfortunately, the harsh conditions that are often employed lead to extensive structural modification of the lignin components which makes them difficult to valorise, especially by selective depolymerisation to aromatic monomers.

Method used

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  • Modified lignin and separation methods
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Embodiment Construction

[0014]According to a first aspect the present invention provides a method of processing a lignocellulosic feedstock, the method comprising:[0015]heating the lignocellulosic feedstock in a solvent mixture comprising an acid and at least 80% by volume of n-butanol to produce a reaction mixture including a butylated lignin.

[0016]The composition of solvent mixtures used for the methods of processing a lignocellulosic feedstock described herein does not include the presence of water, or other components that are present in the lignocellulosic feedstock itself. A dried cellulosic feedstock such as a sawdust may have from 5% to 20% water content. An undried lignocellulosic feed stock may have higher water content.

[0017]The production of a butylated lignin by the methods described herein has been found to produce a reaction mixture from which good quality lignin, cellulose and hemicellulose products may be readily obtained as described further hereafter. With some feedstocks, especially woo...

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Abstract

A method of processing a lignocellulosic feedstock includes heating the lignocellulosic feedstock in a solvent mixture comprising an acid and at least 80% by volume of n-butanol to produce a reaction mixture including a butylated lignin. A butylated lignin product wherein at least 85% of the β-O-4 linkages include n-butyl ether groups can be prepared. Cellulose and butylated hemicellulose products can also be obtained.

Description

FIELD OF THE INVENTION[0001]The present invention relates to the processing of lignocellulosic biomass to provide useful products, in particular but not exclusively to the production of a modified lignin that is suitable for further processing towards useful products. Cellulose and hemi-cellulose products are also provided.BACKGROUND TO THE INVENTION[0002]Lignocellulosic biomass, which comprises cellulose, hemicellulose and lignin is the most abundant source of renewable carbon on the planet and has recently received a lot of attention as a potential source of energy, fuels and chemicals.[0003]Whilst energy, in the form of heat or electricity, can be obtained by simply burning lignocellulosic biomass, the economically viable production of liquid fuels and chemicals from such biomass will require the implementation of high efficiency bio-refineries to produce a range of renewable products.[0004]Amongst attractive bio-refinery products is cellulosic ethanol which can be produced from ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08H7/00C08B1/00C08B37/00
CPCC08H6/00C08B1/00C08B37/0003C08B37/0057C07G1/00Y02E50/10
Inventor WESTWOOD, NICHOLAS JAMESLANCEFIELD, CHRISTOPHER STUART
Owner THE UNIV COURT OF THE UNIV OF GLASGOW
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